Abstract
Taking into account the importance of determining the teleroentgenographic indicators of the spatial position of central incisors, arises a scientific and clinical interest in conducting such studies. The purpose of the study is to develop mathematical models of individual characteristics of the position of upper central incisors in young men and women of Ukraine with orthognathic bite by studying the cephalometric indices and conducting direct stepwise regression analysis. With the help of Veraviewepocs 3D device, Morita (Japan) 38 young men (aged 17 to 21 years) and 55 young women (aged 16 to 20 years) with occlusion close to orthognathic bite and balanced faces received side teleroentgenograms. Cephalometric analysis was performed using OnyxCeph³™ software. Cephalometric points and measurements were performed according to the recommendations of A.M. Schwarz, J. McNamara, W.B. Downs, R.A. Holdway, P.F. Schmuth, C.C. Steiner and C.H. Tweed. In the licensed statistical package “Statistica 6.0”, using the direct stepwise regression analysis, the following teleroentgenographic characteristics of the position of the upper central incisors were performed: distance 1u_APog, distance 1u_Avert, distance 1u_NA, angle Max1_NA, angle Max1_SN and angle Max1_SpP. In young men and women with occlusion close to orthognathic bite and balanced face, reliable regression models of individual teleroentgenographic characteristics of the position of upper central incisors with a determination coefficient of greater than 0.50 have been developed, depending on the peculiarities of the metric characteristics of the craniofacial complex: in young men of 6 possible models, have been constructed 5 with coefficients of determination R2 from 0.672 to 0.928, and for young women – all 6 possible models with determination coefficient R2 from 0.508 to 0.663. In the analysis of models with a determination coefficient higher than 0.50, it was found that in young men most often the regression equations include - the angle AB_NPOG (12.0%); distance COND_GN, inclination angle I, MAX maxillary length, Se_N distance, Nap angle, NBa-PtGn angle, SND angle and Wits indicator (by 8.0%). In young women most often models include – the angle AB_NPOG and the Wits indicator (by 15.4%); angle N_POG (11.5%); the angle Gl’SnPog’ and the distance LPALAT (by 7.7%).
Highlights
One of the most common reasons for appeals to an orthodontist doctor is to improve your smile and change the color of the teeth and position of the frontal group of teeth
Many studies are devoted to this issue and changes that occur with the face during and after orthodontic treatment are described and continue to be studied by many authors [4, 15, 23, 37, 45, 46]
The most accessible and used method is teleroentgenographic research that allows you to determine the position of the central axis of central incisors in relation to different anatomical structures
Summary
One of the most common reasons for appeals to an orthodontist doctor is to improve your smile and change the color of the teeth and position of the frontal group of teeth. The rapid development of computed technology and the use of digital tools offers a new perspective for daily clinical activity. They allow the physician to visualize the ultimate goal of treatment, taking into account the basic laws of aesthetics and harmony, as well as the patient's own wishes, creating an effective communication tool between the dentist and the patient. The use of digital smile design tools - DSD (digital smile design) [16, 25, 29, 31, 38] helps to determine if there is a need to change the shape and size of the teeth themselves by direct or indirect restorations. Orthodontists, having the ability to change the position of the frontal group of teeth, can significantly affect the patient's profile. Many studies are devoted to this issue and changes that occur with the face during and after orthodontic treatment are described and continue to be studied by many authors [4, 15, 23, 37, 45, 46]
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